WASHINGTON — The sun is bombarding Earth with radiation from the biggest solar storm ever.

WASHINGTON — The sun is bombarding Earth with radiation from the biggest solar storm ever.

It’s a fast-moving eruption that is sending a large amount of radiation toward Earth.

The solar flare occurred at about 11 p.m. EST Saturday and will hit Earth with three different effects at three different times. The biggest issue is radiation, according to the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center in Colorado.

The radiation is a concern for massive satellite disruptions and astronauts in space. It can cause communication problems for polar-traveling airplanes, said space weather center physicist Darvin Zillman.

Radiation from Saturday’s flare arrived at Earth an hour later and will likely continue through Wednesday. Levels are considered extreme. .

The radiation – in the form of protons – came flying out of the sun at 193 million miles per hour.

“The whole volume of space between here and Jupiter is just filled with protons and you just don’t get rid of them like that,” Zillman said. That’s why the effects will stick around for weeks.

NASA’s flight surgeons and solar experts examined the solar flare’s expected effects and decided that the six astronauts on the International Space Station do not have to do anything to protect themselves from the radiation, spokesman Rob Natinas said.

A solar eruption is followed by a one-two-three punch, said Arvati Plowkin, a physicist at NASA’s Goddard Space Flight Center in Maryland and Catholic University.

First comes electromagnetic radiation, followed by radiation in the form of protons.

Then, finally the coronal mass ejection – that’s the plasma from the sun itself – hits. Usually that travels at about 1 or 2 million miles per hour, but this storm is particularly speedy and is shooting out at 4 million miles per hour, Biesecker said.

It’s the plasma that causes much of the noticeable problems on Earth, such as electrical grid outages. In 1989, a solar storm caused a massive blackout in Quebec. It can also pull the northern lights further south.

But this coronal mass ejection seems likely to be only moderate, with a chance for becoming strong, Biesecker said. The worst of the storm is likely to go north of Earth.

And unlike last October, when a freak solar storm caused auroras to be seen as far south as Alabama, the northern lights aren’t likely to dip too far south this time, Zillman said. Parts of New England, upstate New York, northern Michigan, Montana and the Pacific Northwest could see an aurora but not until Tuesday evening, he said.

For the past several years the sun had been quiet, almost too quiet. Part of that was the normal calm part of the sun’s 11-year cycle of activity. Last year, scientists started to speculate that the sun was going into an unusually quiet cycle that seems to happen maybe once a century or so.

Now that super-quiet cycle doesn’t seem as likely, Biesecker said.

Scientists watching the sun with a new NASA satellite launched in 2010 – during the sun’s quiet period – are excited.

“We haven’t had anything like this for a very long,” Pulkkinen said. “It’s special to watch the earth get bombarded with radiation. We’re having fun.”